When the gas is heated at constant volume, the heat supplied
Increases the internal energy of the gas and increases the temperature of the gas
Does some external work during expansion
Both (A) and (B)
None of these
Correct Answer :
A. Increases the internal energy of the gas and increases the temperature of the gas
Related Questions
The entropy __________ in an irreversible cyclic process.
Remains constant
Decreases
Increases
None of these
The work ratio of simple gas turbine cycle depends upon
Maximum cycle temperature
Minimum cycle temperature
Pressure ratio
All of these
One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.
9/7
11/7
7/4
1/4
The distance between the centres of the rivets in adjacent rows of zigzag riveted joint is known as
Pitch
Back pitch
Diagonal pitch
Diametric pitch
Producer gas is obtained by
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Carbonisation of bituminous coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C
The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
Boyle's law
Charles' law
Gay-Lussac law
All of these
The work ratio of a gas turbine plant is given by
(Net work output)/(Workdone by the turbine)
(Net work output)/(Heat supplied)
(Actual temperature drop)/(Isentropic temperature drop)
(Isentropic increase in temperature)/(Actual increase in temperature)
If a material expands freely due to heating it will develop
Thermal stresses
Tensile stress
Bending
No stress
A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be
30 MN/m²
50 MN/m²
100 MN/m²
200 MN/m²
When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
Coke
Wood charcoal
Bituminous coal
Briquetted coal
In a steady flow process, the ratio of
Heat transfer is constant
Work transfer is constant
Mass flow at inlet and outlet is same
All of these
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
l/8
l/4
l/2
l
In an irreversible process, there is a
Loss of heat
No loss of heat
Gain of heat
No gain of heat
When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as
Thermodynamic law
Thermodynamic process
Thermodynamic cycle
None of these
A double strap butt joint with equal straps is
Always in single shear
Always in double shear
Either in single shear or double shear
None of these
First law of thermodynamics deals with
Conservation of heat
Conservation of momentum
Conservation of mass
Conservation of energy
In S. I. units, the value of the universal gas constant is
8.314 J/kg mole-K
83.14 J/kgmole-K
831.4 J/kgmole-K
8314 J/kgmole-K
The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
(T1/T2) - 1
1 - (T1/T2)
1 - (T2/T1)
1 + (T2/T1)
Stirling and Ericsson cycles are
Reversible cycles
Irreversible cycles
Semi-reversible cycles
Quasi-static cycles
The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
In the vertical plane
In the horizontal plane
In the same plane in which the beam bends
At right angle to the plane in which the beam bends
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)
1 - rγ - 1
1 + rγ - 1
1 - (1/ rγ - 1)
1 + (1/ rγ - 1)
When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, then
The stress and strain induced is compressive
The stress and strain induced is tensile
Both A and B is correct
None of these
A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
In the middle
At the tip below the load
At the support
Anywhere
The efficiency and work ratio of a simple gas turbine cycle are
Low
Very low
High
Very high
The fuel mostly used in cement industry and in metallurgical processes is
Wood charcoal
Bituminous coke
Pulverised coal
Coke
The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)
π /4 × τ × D³
π /16 × τ × D³
π /32 × τ × D³
π /64 × τ × D³
The efficiency of Diesel cycle with decrease in cut-off
Increases
Decreases
First increases and then decreases
First decreases and then increases
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
δQ = T.ds
δQ = T/ds
dQ = ds/T
None of these
If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
More
Less
Equal
Depends on other factors
A cylindrical section having no joint is known as
Joint less section
Homogeneous section
Perfect section
Seamless section